Aktion: 2 Jahre Wartung gratis sichern!
Mehr erfahren
Print on film labels
Not all materials are equally suitable for printing. How well a surface can be printed depends, among other things, on the surface tension and wettability – how a water droplet spreads over it.
Problems with printing on plastic
Smooth and non-absorbent materials such as plastic are particularly challenging. This is because most plastics, which are also used in the various label films, have a so-called ‘non-polar’ (low-energy) and water-repellent surface to which prints adhere only with great difficulty.
Optimal printing results with special treatment
To achieve optimal printing results with film labels, the film must be specially pre-treated on the top side in advance.
Two standards have been established and proven in the market: the application of a permanent top coat, a type of print varnish, or, alternatively, the much more cost-effective corona treatment.
Untreated film
The ink runs on the plastic surface and does not cover up
Better adhesion properties with corona treatment
During corona treatment, the film is exposed to a high-voltage discharge, which increases the surface tension (dynung) and thus the adhesion properties of the material. Pretreated in this way, films can also be printed permanently and smudge-proof, e.g. in flexographic printing. However, as the tension is released again over time, the adhesion also decreases;
But there is a solution for this too: for optimum printing results, corona-pretreated materials are refreshed again with surface tension in special corona systems immediately before processing.
Corona-treated film
The ink adheres and covers perfectly.
Cost-effective alternative to top coats
The Weber Marking Systems has a corresponding system in its label production, so that in addition to numerous films with top coats, the extensive film portfolio also includes low-cost alternatives to corona-treated films. For many printing applications, corona-treated films are perfectly adequate and the results are absolutely satisfactory.
